What about applying of heena on chest by men?
I know that men shouldn't apply henna to their hands or feet. but what about the rest of the body, like the chest??

Answer:

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بسم
الله الرحمن
الرحيم

We begin with Allah’s blessed name, we praise him and we glorify him, seek his forgiveness and ask him to guide us. Whoever Allah guides, None can lead astray and whoever he misguides, None can guide. There is no power and no strength except from Allah, The most high, the Most great, the most powerful. We bear witness that there is no one worthy of worship but Allah Alone, and we bear witness that Prophet Muhammad (pbuh) is His slave-servant and the seal of His Messengers. We pray for peace and blessings on all the noble messengers and in particular on the last of them all “the blessed prophet Mohammad (pbuh)”

Narrated AbuHurayrah: A hermaphrodite (mukhannath) who had dyed his hands and feet with henna was brought to the Prophet (peace_be_upon_him). He asked: What is the matter with this man? He was told: Apostle of Allah! he affects women's get-up. So he ordered regarding him and he was banished to an-Naqi'. The people said: Apostle of Allah! should we not kill him? He said: I have been prohibited from killing people who pray. AbuUsamah said: Naqi' is a region near Medina and not a Baqi'. ABU-DAWOOD [BOOK :41, HADITH: 4910]

From the above guidance of our beloved prophet Mohammad (pbuh), the applying of henna on hand or feet is permissible only for women.

Narrated AbuDharr: The Prophet (peace_be_upon_him) said: The best things with which grey hair are changed are henna and katam. ABU-DAWOOD [BOOK:33, HADITH: 4193]

To the best of our knowledge, There is absolutely nothing In Islam that would prohibit a man from apply heena to his chest.
And Allah alone knows the best.

I ask Allah to make this a sincere effort, seeking his pleasure, and I ask him to grant us refuge in him from the evils within ourselves, and that in our deeds. I ask him to grant us success in achieving whatever pleases him; And May Allah Shower His blessings and mercy upon our beloved Prophet
Muhammad (pbuh), his family and his Companions and on all those who follow him until the final hour.